# CVE-2024-53271: HTTP/1.1 multiple issues with envoy.reloadable_features.http1_balsa_delay_reset in envoy


- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 18 Dec 2024
- **Updated:** 18 Dec 2024
- **Also known as:** BIT-envoy-2024-53271, GHSA-rmm5-h2wv-mg4f

## What is CVE-2024-53271?

CVE-2024-53271 is a high-severity vulnerability in Envoyproxy Envoy, published on 18 Dec 2024. 

### Official description

Envoy is a cloud-native high-performance edge/middle/service proxy. In affected versions envoy  does not properly handle http 1.1 non-101 1xx responses. This can lead to downstream failures in networked devices. This issue has been addressed in versions 1.31.5 and 1.32.3. Users are advised to upgrade. There are no known workarounds for this issue.

Weakness: CWE-670 (Always-Incorrect Control Flow Implementation)

## Which versions are affected by CVE-2024-53271?

1 open source package ship an affected version, including envoy. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `envoy` | Bitnami | From 1.31.0 | 1.31.5, 1.32.3 |

Products: Envoyproxy Envoy.

## How do I fix CVE-2024-53271?

Upgrade envoy to a fixed version for your release line: 1.31.5 or 1.32.3.

## Is CVE-2024-53271 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-53271 exists.

## Other vulnerabilities in Envoyproxy Envoy

- [CVE-2022-29226](https://insights.sbomify.com/CVE-2022-29226/): Trivial authentication bypass in Envoy (critical 10.0)
- [CVE-2019-18801](https://insights.sbomify.com/CVE-2019-18801/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-18802](https://insights.sbomify.com/CVE-2019-18802/): Security feature bypass in n/a (critical 9.8)
- [CVE-2020-35470](https://insights.sbomify.com/CVE-2020-35470/): Information disclosure in n/a (high 8.8)
- [CVE-2024-23324](https://insights.sbomify.com/CVE-2024-23324/): Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-53271 and fix it if it is affected.

What it is: CVE-2024-53271 is a high-severity vulnerability in Envoyproxy Envoy, published on 18 Dec 2024. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-53271 exists.

Affected packages and fixed versions:
- envoy (Bitnami): affected from 1.31.0; fixed in 1.31.5, 1.32.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-53271/ (Markdown: https://insights.sbomify.com/CVE-2024-53271/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-53271
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-53271
- OSV: https://osv.dev/vulnerability/CVE-2024-53271

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-53271/
Summaries are generated and may contain mistakes; the official description above is the record.